Ann. occup. Hyg., Vol. 46, No. suppl_1, pp. 115-117, 2002
© 2002 British Occupational Hygiene Society
Published by Oxford University Press
The Inadequacy of Describing Fibres by Counting Techniques
Research Institute of Occupational Health, Russian Academy of Medical Science 31 Prospect Budennogo, 105275 Moscow, Russia
*Author to whom correspondence should be addressed. Tel: +7-095-366-05-83, +7-095-365-22-55; fax: +7-095-366-05-83; e-mail: izmerov{at}rinet.ru
The inadequacy of fibre-counting techniques is discussed based on scientific data and personal experience. The following aspects are considered: (i) only respirable fibres are counted, but this is not enough; (ii) the fibres that are not considered respirable (<5 µm) also possess biological activity; (iii) it is necessary to take into account characteristics of all fibres found in the breathing zone, but phase contrast optical microscopy (PCOM) techniques do not fit this purpose; (iv) as well as particle-size distribution and other characteristics of all fibres, it is important to know their mass; and (v) every PCOM technique is only an approximate indicator of the exposure to fibres.
fibres asbestos respirable and total dust counting and gravimetrical measurements biological activity Russia